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(11) | EP 1 280 202 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | High performance cooling device |
(57) A low-cost, fan assisted cooling device is disclosed. The cooling device 10 includes a narrow bottom 11a and broad top shape 29 to optimize a material versus performance ratio. A plurality of vanes 21 surround a central heat mass 11 and an inside surface 26 of the vanes 21 define a chamber 30 that surrounds the heat mass11. A portion of each vane 21 is split into a plurality of fins 23 and both the vanes 21 and the fins 23 have a surface area that increase in a radially outward direction r from an axis Z-Z of the heat mass 11. The heat mass 11 includes a boss 13 that is surrounded by a groove 15. Both the boss 13 and the grove 15 have arcuate surface profiles. The vanes 21, the fins 23, the boss 13, and the groove 15 efficiently dissipate heat when a fan 70 or the like forces air F into the chamber 30 thereby producing air flows in three different directions. In a first direction E, the air flows out of the chamber 30 through the vanes 21. In a second direction I, a low pressure region ΔP in the chamber 30 induces air from outside the chamber 30 to flow through the fins 23. In a third direction B, the low pressure region ΔP induces an airflow over the groove 15 and boss 13. Openings P between the vanes are angled and offset from an orientation of the fans blades 77 to minimize the airflow shock losses thereby reducing fan noise. The vanes 21 and the fins 23 can be homogeneously formed with the heat mass 11. |